veilsideTT Posted March 28, 2004 Share Posted March 28, 2004 Hi all. Finally got to the "turning of the key" point today after rebuilding my TT engine (Shortblock Installed) Unfortunatly she wouldnt fire. Engine turns over fine though. I went straight for the fuel side of things and after a while i managed to trace the problem to the fuel pump. With the ignition on, the fuel pump isnt pumping at all. But 12V across it and she pumps. I bypassed the Immobiliser cuts down at the ECU just incase it was the alarm (very dodgy old toyota alarm) cutting the fuel. but no joy there. Any ideas anyone as ive about given up for the day on it now! Scott Quote Link to comment Share on other sites More sharing options...
Supra ST Myster Posted March 28, 2004 Share Posted March 28, 2004 Is there 12V going to the Fuel Pump ECU and 9V comming out of it?? 12V should be on the blue/orange wire or solid blue depending of year of car when ignition is on and 9V approx on the blue/red wire? Quote Link to comment Share on other sites More sharing options...
veilsideTT Posted March 28, 2004 Author Share Posted March 28, 2004 Not something i have checked but i can have a look at it. I take it i should be working back from the Pump to the ECU then? If i have nothing (Voltage) going into the Fuel ECU then where does the wiring go before that? straight to the ECU? Could a bad earth that i have installed cause a problem like this? Are there any other places where Toyota would have installed cuts in Fuel Wires for the Immobiliser apart from at the ECU? Cheers Scott Quote Link to comment Share on other sites More sharing options...
Supra ST Myster Posted March 28, 2004 Share Posted March 28, 2004 Think there is a fuse inline for the power for the ECU, but not sure where it is, if you are getting 9V out on the blue/red wire that should be going to the pump. Quote Link to comment Share on other sites More sharing options...
veilsideTT Posted March 28, 2004 Author Share Posted March 28, 2004 I tested down at the ECU pins for the EFI relays. No current there when ignition on! Does that mean that something else is telling the ECU not to send any power down to the Pump?? Scott Quote Link to comment Share on other sites More sharing options...
SimonB Posted March 28, 2004 Share Posted March 28, 2004 I think the engine has to be running or cranking for the ECU to run the fuel pump, to stop it pumping fuel all over you if you have an accident. Quote Link to comment Share on other sites More sharing options...
veilsideTT Posted March 28, 2004 Author Share Posted March 28, 2004 good point if thats true. But i have no fuel pumping through even when i crank (Took the delivery pipe off the fuel filter) Think i have checked the wrong pins on ECU for the Fuel Pump. I looked at the EFI pins not the Fuel Pump pins. Will have to check that tommorow now. Scott Quote Link to comment Share on other sites More sharing options...
Matt Harwood Posted March 28, 2004 Share Posted March 28, 2004 Simon's right. When the ignition is switched on, the fuel pump will work for a second or so, then stop, until the engine is cranked. Check the two thick wires at the pumps ECU, (blue/orange and Blue/red). You should have 12v ignition input on one, and anything from 5v upwards on the other. (yes I know it should be 9v, but I've tested this wire on a number of cars and it's always lower than 9v at idle). You can cut the two wires and join them together, to get it running. This is the 12v mod on mkiv.com. Personally, I use a relay controlled from the pumps ECU, to make sure the pump stops pumping should the engine stop... HTH Quote Link to comment Share on other sites More sharing options...
veilsideTT Posted March 28, 2004 Author Share Posted March 28, 2004 Without actually testing each side of the Pump ECU i cant be 100% sure but i doubt there is any current going to the Pump ECU. Only reason i say this is because with the delivery pipe disconnected (At Fuel Filter) and the engine cranking i have not got any fuel comming through. But if i put 12V battery onto the pump it flows fuel out of the delivery pipe! scott Quote Link to comment Share on other sites More sharing options...
Matt Harwood Posted March 28, 2004 Share Posted March 28, 2004 I know it's stating the obvious but, have you checked all the fuses? - Both fuseboxes? Quote Link to comment Share on other sites More sharing options...
veilsideTT Posted March 28, 2004 Author Share Posted March 28, 2004 Ive checked the fuses in the Engine bay. But not checked the relay type fuses (EFI Main etc) as im not sure how you check those. Quote Link to comment Share on other sites More sharing options...
Matt Harwood Posted March 28, 2004 Share Posted March 28, 2004 You know there's another fusebox in the drivers kickwell? - I haven't checked if there are any engine related fuses in there, but it's worth a go... Quote Link to comment Share on other sites More sharing options...
veilsideTT Posted March 28, 2004 Author Share Posted March 28, 2004 I will check them as im willing to try anything. Up to now i need to: Check the (Main)ECU pins for the Fuel Pump for a current on crank Check all Fuses Any other suggestions welcome! Thanks all Scott Quote Link to comment Share on other sites More sharing options...
Matt Harwood Posted March 28, 2004 Share Posted March 28, 2004 Don't quote me on this, but I think the pumps ecu takes its 'go' signal from the crank position sensor... Make sure it's plugged in? Quote Link to comment Share on other sites More sharing options...
veilsideTT Posted March 28, 2004 Author Share Posted March 28, 2004 Something i will look at for sure. Can only think that somthing like that could have Disconnected/Cut when putting the engine back in if that was the case. I know it was connected when i put the loom on the engine before dropping it in. Cheers Matt Quote Link to comment Share on other sites More sharing options...
veilsideTT Posted March 29, 2004 Author Share Posted March 29, 2004 ok, Ive checked all fuses and there fine. Ive checked the crank position sensor, that is all connected and ok. Ive looked all around the enigine for loose connnectors or earths, no problems there I tested the current at the Main ECU for the fuel pump (pins 21&22). Nothing there on ignition or crank. that rules out anything past there like Fuel Pump ECU and Fuel Pump. What more can i do! Its driving me mad! Quote Link to comment Share on other sites More sharing options...
veilsideTT Posted March 30, 2004 Author Share Posted March 30, 2004 Anyone? Anything? Quote Link to comment Share on other sites More sharing options...
Supra ST Myster Posted March 30, 2004 Share Posted March 30, 2004 all relays plugged in ok? Quote Link to comment Share on other sites More sharing options...
veilsideTT Posted March 30, 2004 Author Share Posted March 30, 2004 yep, checked the lot! Its really getting to me now. Think i may have to get a Pro in for this one (And a Mechanic!) Quote Link to comment Share on other sites More sharing options...
Supra ST Myster Posted March 30, 2004 Share Posted March 30, 2004 is the EFI relay being brought on? Quote Link to comment Share on other sites More sharing options...
veilsideTT Posted March 30, 2004 Author Share Posted March 30, 2004 Nope! Quote Link to comment Share on other sites More sharing options...
jagman Posted March 30, 2004 Share Posted March 30, 2004 could it be the eec has logged a fault in memory and is inhibiting the fuel pump until the fault is cleared ,I guess youve pulled the eec fuses and tried a reset ,failing that you will need to read any stored failures hth Quote Link to comment Share on other sites More sharing options...
veilsideTT Posted March 30, 2004 Author Share Posted March 30, 2004 Problem Solved!!! Checked all the Connecters down at the ECU. There is one plug (Orange on on the firewall) that has like a plastic arm that has to be pulled down to lock the plug in place. I had not pulled it down. There must be some sort of mechanisim that makes the connecton when you pull the lever down! She started straight the way!!!! Thanks all for your help. Sorry if my stupid mistake wasted your time everyone Scott Quote Link to comment Share on other sites More sharing options...
Supra ST Myster Posted March 30, 2004 Share Posted March 30, 2004 glad you have sorted it!! Quote Link to comment Share on other sites More sharing options...
veilsideTT Posted March 30, 2004 Author Share Posted March 30, 2004 Me too, me too!!!! I jumped around the drive like a kid when it started!! Quote Link to comment Share on other sites More sharing options...
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